CN210510454U

CN210510454U - Execution time adjustable electric valve actuator control device

Info

Publication number: CN210510454U
Application number: CN201921456709.7U
Authority: CN
Inventors: 王博; 汤伟; 董继先; 黄勋; 刘欢
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-05-12
Anticipated expiration: 2029-09-03

Abstract

The utility model discloses an execution time adjustable electric valve executor controlling means, include the electric valve executor with DC brushless motor drive, the controller uses the singlechip as the core, through liquid crystal display and operating button's combination operation, sets for the execution time of valve, calculates the commutation frequency of valve DC brushless motor rotational speed and DC brushless motor PWM drive circuit, drives the valve and moves according to predetermined execution time length. The utility model discloses a liquid crystal display sets for electric valve executor's execution time, compares the nonadjustable current situation of current valve execution time, and the execution time of valve is set for in a flexible way according to the needs of control to the different operating modes of reply.

Description

Execution time adjustable electric valve actuator control device

Technical Field

The utility model belongs to the fluid machinery field relates to the electric valve executor of incremental adjustment, in particular to execution time adjustable electric valve executor controlling means.

Background

Electrically actuated valves are important fluid flow control devices in the process industry, as are important fluid flow control elements. At present, an electric valve actuator applied in industry is generally driven by an asynchronous motor or a synchronous motor, and adopts an incremental regulation rule to receive a valve opening regulation signal or a valve closing regulation signal sent by an upper control system and convert the valve opening regulation signal or the valve closing regulation signal into driving currents with positive phase sequence and negative phase sequence, so that the driving motor rotates forwards or backwards, and then a driving valve core is driven by a transmission mechanism to move towards the direction of increasing or decreasing the opening degree, and the regulation of the fluid flow in a pipeline is realized, wherein the structure and the control principle of the valve are shown in fig. 1.

Fig. 1 (a) is a schematic structural diagram of a conventional common electric control valve, wherein 1 is a valve driving motor, which is mostly an asynchronous motor or a synchronous motor, 2 is a valve transmission mechanism, 3 is a valve rod, and 4 is an adjusting valve body. Fig. 1 (b) is a schematic diagram of a typical control system of an existing electric regulating valve, which takes a winding 7 as a three-phase motor winding as an example, and illustrates that power frequency three-phase alternating current is respectively connected to a forward rotation control solid-state relay 5 and a reverse rotation solid-state relay 6, when the forward rotation solid-state relay 5 is turned on, the valve motor winding 7 rotates forward (or reversely) through positive phase sequence alternating current, so as to drive the valve to operate in a large (or small) opening direction; when the reverse rotation solid state relay 6 is conducted, the valve motor winding 7 rotates reversely (or positively) through the alternating current of the reverse phase sequence, so that the valve is driven to rotate towards the direction of closing or opening, and valve position adjustment is realized. The driving motor 1 of the valve also has a single-phase motor type, a direct current motor type, a synchronous motor type and the like, but the working principle is basically the same, and the valve position is incrementally adjusted by controlling the forward rotation or the reverse rotation of the driving motor 1 of the valve through a forward rotation or reverse rotation control relay (or other circuit switching devices).

The valve is characterized in that the rotating speed of a valve driving motor is fixed, for example, a three-phase asynchronous motor with 4-pole windings is used, the rated rotating speed is about 1450 revolutions, the rated rotating speed of a single-phase motor is also fixed, and the execution time of the valve is not adjustable under the condition that the reduction ratio of a valve transmission system is fixed. The time length of the valve from the fully open state to the fully closed state is called the execution time of the valve, and the common specifications are 15 seconds, 30 seconds, 60 seconds, 120 seconds and the like. In an incremental regulation law, the incremental movement of the valve is considered to be proportional to the length of the duration of the control signal. When the valve is operated, the valve is required to be continuously opened or closed around a certain opening degree. When the control signal is connected with the driving current, the valve motor needs to be accelerated to a rated rotating speed from a static state and run for a period of time; when the control signal disconnects the drive current, the inertia of the valve motor and drive system causes the valve to continue to rotate for a period of time. If the time for switching on the valve action control signal is too short, the valve cannot rotate correspondingly due to inertia of a valve motor and a transmission system, or the action increment of the valve and the duration time of the control signal are not in a linear proportional relationship, so that the adjusting performance of the valve is poor. Therefore, there is a problem of minimum operation time for such a valve, and the minimum time for which the valve can generate a linear proportional relationship with the length of the control signal operation time is referred to as the minimum operation time. The ratio of the valve execution time to the minimum actuation time is called the maximum number of operation steps of the valve. Modern process industries are increasingly producing fine, high standards, and it is desirable to have valves with higher adjustment accuracy, more operating steps and shorter actuation times. Conversely, there are conditions where it is desirable to have a valve that can be closed or opened quickly, with shorter valve execution times being preferred.

Aiming at the problem, if an electric valve actuator with adjustable execution time length can be developed, under the working condition of needing long execution time, the valve has more operation steps, so that the positioning precision of the valve actuator can be improved; under the working condition that short execution time is needed, the valve execution time can be set to be short time so as to improve the valve positioning speed or shorten the opening and closing time.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an execution time adjustable electric valve executor controlling means to overcome the nonadjustable problem of current electrical control valve execution time, the utility model discloses can rely on valve direct current brushless motor drive and corresponding control system, realize the adjustment of valve execution time, can set for the execution time of valve according to the operating mode, adapt to the requirement of different work condition to execution time length.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an execution time adjustable electric valve executor controlling means, including the singlechip, the 1 st to 6 th PWM control port of singlechip are connected to DC brushless motor PWM drive circuit, DC brushless motor PWM drive circuit is connected to DC brushless motor's three-phase winding respectively, DC brushless motor's rotor position feedback device HU, HV, HW is connected to the 1 st to 3 rd digital input port of singlechip through DC brushless motor rotor position detection circuitry, the 1 st analog input port of singlechip is connected to valve aperture detection circuitry, the 4 th and 5 th digital input port of singlechip are connected to opening limit switch and closing limit switch through valve full-on full-off state detection circuitry respectively, the 6 th to 9 th digital input port of singlechip are connected to the operating button who is used for realizing that the valve is manual, automatic operation and parameter setting, the 10 th and 11 th digital input port of singlechip connect upper DCS control system respectively and open valve regulating signal and DCS control system The valve closing adjusting signal also comprises a power module connected to the single chip microcomputer and the direct current brushless motor PWM driving circuit.

Further, still include liquid crystal display, liquid crystal display passes through the SPI port connection of SPI bus with the singlechip.

Further, the dc brushless motor is a three-phase inductive dc brushless motor.

Further, the power module comprises a 5V DC power supply for supplying power to the singlechip and a 24V DC power supply for supplying power to the PWM driving circuit of the direct-current brushless motor.

Further, the operation buttons include an AUTO button for placing the valve in an automatic operation state, a MANUAL button for setting the valve in a MANUAL state, and an OPEN button and a CLOSE button for performing valve opening and closing operations.

Compared with the prior art, the utility model discloses following profitable technological effect has:

compared with the problem that the opening and closing speed of the existing common electric valve is fixed, the device of the utility model realizes the valve execution time adjustment, and can set the valve execution time longer under the condition of needing fine control so as to have more operation steps and realize accurate adjustment; under the condition that quick opening and closing are needed, the valve execution time can be set to be shorter, and quick positioning of the valve can be realized by fewer operation steps. Under the condition of requiring fine positioning operation of the valve, the flow control can be accurately realized at a lower running speed and a smaller opening increment.

Drawings

Fig. 1 is a schematic diagram of a structure and a control system of a conventional electric control valve, wherein (a) is a schematic diagram of a structure of a conventional common electric control valve, and (b) is a schematic diagram of a typical control system of a conventional electric control valve;

FIG. 2 is a schematic view of the electric control valve of the present invention;

figure 3 is a schematic diagram of the controller of the present invention.

Wherein, 1 is valve driving motor, 2 is valve drive mechanism, 3 is the valve rod, 4 is the adjusting valve body, 5 is corotation solid state relay, 6 is the reversal solid state relay, 7 is the valve motor winding, 8 is the brushless motor of direct current.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

the utility model relates to an execution time adjustable electric valve executor controlling means is shown in fig. 3, this controlling means uses the singlechip as the control core, the 1 st to the 6 th PWM control port and the DC brushless motor PWM drive circuit of singlechip are connected, the order break-make of 6 MOS pipes of controlling DC brushless motor PWM drive circuit respectively, DC brushless motor PWM drive circuit is connected with DC brushless motor's three-phase winding respectively, can be in order to produce drive DC brushless motor's moving electric current, switching frequency and duty cycle through controlling 6PWM ports, can realize DC brushless motor's speed governing operation. Rotor position feedback devices HU, HV and HW of the direct current brushless motor are connected to the 1 st to 3 rd digital quantity input ports of the single chip microcomputer through a direct current brushless motor rotor position detection circuit and used for detecting the rotor position of the direct current brushless motor so as to realize rotor position closed-loop position control or speed closed-loop control of the direct current brushless motor; the 1 st analog input port of the singlechip is connected with a valve opening detection circuit, and the real-time opening of the valve is detected by measuring the voltage output by a middle tap of the potentiometer; the 4 th and 5 th digital input ports of the singlechip are respectively connected with the opening limit switch and the closing limit switch through a valve full-opening and full-closing state detection circuit to realize the detection of the full-opening state and the full-closing state of the valve, and when the valve reaches the full-opening position, the valve cannot move towards the direction of the opening even if a valve opening control signal is switched on; when the valve reaches the full-closed position, even if the related valve control signal is switched on, the valve cannot operate towards the direction of closing the valve, so that mechanical damage caused by overtravel of the valve is protected; the four operating buttons are respectively connected with the 6 th to 9 th digital input ports of the single chip microcomputer, the four operating buttons are AUTO, MANUAL, OPEN and CLOSE buttons, when the AUTO button is pressed, the valve can be placed in an automatic operation state, and the opening adjustment of the valve is controlled by an upper DCS control signal; when the MANUAL button is pressed, setting the valve to be in a MANUAL state, wherein the valve does not respond to a control signal of an upper DCS control system, the valve opening and closing operation is controlled by an OPEN button and a CLOSE button, and when the OPEN button is pressed, a valve motor rotates forwards (or reversely) to drive the valve to move towards the direction of opening (or closing) the valve; when the CLOSE button is pressed down, the valve motor rotates reversely (or rotates forwards) to drive the valve to move towards the direction of closing or opening; the setting operation of the valve control parameters is realized through the combined operation of AUTO, MANUAL, OPEN and CLOSE buttons; the 10 th and 11 th digital input ports of the single chip microcomputer are respectively connected with an upper DCS control system valve opening regulating signal and a valve closing regulating digital signal, when the valve is set in an automatic state and the upper DCS control system valve opening regulating signal is switched on, the valve motor rotates forwards (or reversely), and drives the valve to move towards the opening direction (or the closing direction); when a valve closing adjusting signal of the upper DCS control system is switched on, the valve motor rotates reversely (or rotates forwards) to drive the valve to move towards the direction of closing small (or opening large); when the upper DCS control system is not switched on when the valve opening or closing adjusting signal is not switched on, the valve motor stops rotating, and the valve core is in a static state; the controller is provided with a liquid crystal display screen, the liquid crystal display screen is connected with and communicated with an SPI port of the single chip microcomputer through an SPI bus to realize data transmission, and relevant information of valve operation is displayed, wherein the relevant information comprises valve execution time, and the real-time opening degree and the valve opening and closing valve state of the valve are displayed in a percentage form of 0-100%; the power module is respectively connected to the singlechip and the PWM drive circuit of the direct current brushless motor and provides power supplies with different specification voltages for the control system.

The DC brushless motor of the electric valve actuator is a three-phase inductive DC brushless motor and is driven by a DC brushless motor PWM drive circuit, the rotating speed of the DC brushless motor is controlled by the phase-change frequency of the DC brushless motor PWM drive circuit, and a Hall element position sensor of the motor detects the position signal of a motor rotor in real time and transmits the position signal to a singlechip, thereby realizing speed closed-loop control.

The valve control system inputs valve execution time through a liquid crystal display screen and a combined key of an operation button, under the condition that the stroke range of the valve actuator is determined, phase change frequency of a PWM (pulse-width modulation) driving circuit of the direct-current brushless motor is calculated according to a linear proportional relation, and the 1 st to 6 th PWM control ports are controlled to be sequentially switched on and off, so that the valve operates according to the set execution time.

The liquid crystal display screen is connected with a port of the single chip microcomputer in an SPI bus mode, display data including a valve position and a valve opening and closing state are obtained through the bus and pressed together with the operation buttons, valve control parameters are set, the operation state includes the valve position displayed in a range of 0-100%, and the parameter setting includes valve execution time.

The operation buttons comprise four buttons of OPEN, CLOSE, MANUAL and AUTO, the MANUAL button is a MANUAL button, and the valve responds to the local operation of OPEN and CLOSE switches after the MANUAL button is pressed; the AUTO button is an automatic button, and after the AUTO button is pressed, the valve responds to DCS opening and DCS closing operation signals sent by the upper control system; the four buttons can realize the setting of the valve control parameters through combined operation.

The power module provides 5V DC power respectively for the singlechip power supply, and 24V DC power is for direct current brushless motor PWM drive circuit power supply.

The following detailed description of the embodiments of the present invention:

as shown in fig. 2, the structure of the electric control valve of the present invention is improved on the basis of the mechanical structure of the common electric control valve, and utilizes the transmission system of the existing valve and the structures of the valve rod, the valve body, etc. to replace the asynchronous motor, the synchronous motor or the dc motor of the existing valve with the dc brushless motor 8. The benefit of doing so is that make full use of current valve pin volume big, mechanical structure is ripe, the general advantage of spare part, the valve enterprise of being convenient for produces the utility model discloses a novel electric control valve.

As shown in fig. 3, the utility model relates to an execution time adjustable electric valve executor controlling means, this controller uses the singlechip as the control core, the 1 st to the 6 th PWM control port of singlechip are connected with direct current brushless motor PWM drive circuit, the order break-make of 6 MOS pipes of controlling PWM drive circuit respectively, PWM drive circuit is connected with direct current brushless motor's three-phase winding respectively, can be in order to produce drive direct current brushless motor's moving electric current, switching frequency and duty cycle through controlling 6PWM ports, can realize direct current brushless motor's speed governing operation. Rotor position feedback devices HU, HV and HW of the direct current brushless motor are connected to 1 st to 3 rd digital input ports of the single chip microcomputer and used for detecting the rotor position of the direct current brushless motor so as to realize closed-loop position control or speed closed-loop control of the rotor position of the direct current brushless motor; the 1 st analog input port of the singlechip is connected with a valve opening detection circuit, and the real-time opening of the valve is detected by measuring the voltage output by a middle tap of the potentiometer; the 4 th and 5 th digital input ports of the singlechip are respectively connected with the opening limit switch and the closing limit switch to realize the detection of the fully opening state and the fully closing state of the valve, and when the valve reaches the fully opening position, the valve cannot move towards the direction of opening the valve even if a valve opening control signal is switched on; when the valve reaches the full-closed position, even if the related valve control signal is switched on, the valve cannot operate towards the direction of closing the valve, so that mechanical damage caused by overtravel of the valve is protected; the four operating buttons are respectively connected with the 6 th and 9 th digital input ports of the singlechip, the four operating buttons are AUTO, MANUAL, OPEN and CLOSE buttons, when the AUTO button is pressed, the valve can be placed in an automatic operation state, and the opening adjustment of the valve is controlled by an upper DCS control signal; when the MANUAL button is pressed, setting the valve to be in a MANUAL state, wherein the valve does not respond to a control signal of an upper DCS control system, the valve opening and closing operation is controlled by an OPEN button and a CLOSE button, and when the OPEN button is pressed, a valve motor rotates forwards (or reversely) to drive the valve to move towards the direction of opening (or closing) the valve; when the CLOSE button is pressed down, the valve motor rotates reversely (or rotates forwards) to drive the valve to move towards the direction of closing or opening; the setting operation of the valve control parameters is realized through the combined operation of AUTO, MANUAL, OPEN and CLOSE buttons; the 10 th and 11 th digital input ports of the single chip microcomputer are respectively connected with an upper DCS control system valve opening regulating signal and a valve closing regulating digital signal, when the valve is set in an automatic state and the upper DCS control system valve opening regulating signal is switched on, the valve motor rotates forwards (or reversely), and drives the valve to move towards the opening direction (or the closing direction); when a valve closing adjusting signal of the upper DCS control system is switched on, the valve motor rotates reversely (or rotates forwards) to drive the valve to move towards the direction of closing small (or opening large); when the upper DCS control system is not switched on when the valve opening or closing adjusting signal is not switched on, the valve motor stops rotating, and the valve core is in a static state; the controller is provided with a liquid crystal display screen, the liquid crystal display screen is connected with and communicated with an SPI port of the single chip microcomputer through an SPI bus to realize data transmission, and relevant information of valve operation is displayed, wherein the relevant information comprises valve execution time, and the real-time opening degree and the valve opening and closing valve state of the valve are displayed in a percentage form of 0-100%; the power supply module is respectively connected to the single chip microcomputer and the PWM driving module and provides power supplies with different specification voltages for the control system.

The direct current brushless motor of the electric valve actuator is a three-phase inductive direct current brushless motor and is driven by a PWM (pulse-width modulation) driving circuit, the rotating speed of the direct current brushless motor is controlled by the phase-changing frequency of the PWM driving circuit, and a Hall element position sensor of the motor detects a motor rotor position signal in real time and transmits the motor rotor position signal to a single chip microcomputer to realize speed closed-loop control.

The control method of the electric valve actuator with the adjustable execution time comprises the following steps:

1. collecting main technical parameters of the valve driving motor, including obtaining the maximum achievable operation speed n of the motor according to the rated speed of the brushless DC motor_ratedWhen the rotating speed of the valve DC brushless motor is set, the value is not exceeded; the number p of pole pairs of the motor;

2. the speed reduction ratio from a valve driving motor to an actuator output shaft is set to be N, the output stroke range of a valve actuator is 0-90 degrees, the execution time of the valve from full opening to full closing is T (seconds), and the execution time of the valve from full opening to full closing can be input on a liquid crystal display screen through the combined operation of operation buttons;

3. calculating the rotating speed n required to be set by the valve driving motor_svIn rpm (revolutions per minute);

4. calculating the commutation frequency f (Hz) of the PWM driving circuit of the direct current brushless motor of the valve controller:

and the singlechip control system of the valve controls the sequential on-off of the 1 st to 6 th PWM control ports according to the calculated commutation frequency, drives the valve DC brushless motor to operate according to the specified rotating speed, and realizes the execution time adjustment of the valve actuator.

The liquid crystal display screen is connected with a port of the single chip microcomputer in an SPI bus mode, display data including a valve position and a valve opening and closing state are obtained through the bus and pressed together with the operation buttons, valve control parameters are set, the operation state includes the valve position displayed in a range of 0-100%, and the parameter setting includes valve execution time. The singlechip use STM32F 103's Cortex-M3 series as the embodiment, realize the utility model discloses a control, wherein the PA 8-PA 10 of singlechip, PB 13-PB 15 are respectively as the 1 st to the 6 th PWM control port, PA 1-PA 3 are respectively as the 1 st to the 3 rd digital quantity input port, PA 4-PA 7 are as the SPI interface with liquid crystal display communication, PB0 is as the 1 st analog quantity input port, PB 3-PB 4 are respectively as the 4 th to the 5 th digital quantity input port, PB 5-PB 8 are respectively as the 6 th to the 9 th digital quantity input port, PB 9-PB 10 are respectively as the 10 th to the 11 th digital quantity input port. The operation buttons comprise four buttons of OPEN, CLOSE, MANUAL and AUTO, the MANUAL button is a MANUAL button, and the valve responds to the local operation of OPEN and CLOSE switches after the MANUAL button is pressed; the AUTO button is an automatic button, and after the AUTO button is pressed, the valve responds to DCS opening and DCS closing operation signals sent by the upper control system; the four buttons can realize the setting of the valve control parameters through combined operation. The power module provides 5V DC power respectively for the singlechip power supply, and 24V DC power is for direct current brushless motor PWM drive circuit power supply. The PWM driving circuit has the function of converting the direct current of 24V DC into the three-phase driving current of the direct current brushless motor to drive the valve direct current brushless motor to operate. The direct current brushless motor is a three-phase direct current brushless motor, is driven by a PWM (pulse-width modulation) driving circuit, and transmits a rotor position signal to the singlechip through a Hall element position sensor of the motor, so that speed closed-loop control is realized.

The utility model discloses can rely on valve direct current brushless motor drive and corresponding control system, realize the adjustment of valve execution time, compare in the nonadjustable problem of prior art valve execution time, can set for the execution time of valve according to the operating mode, adapt to the requirement of different operating modes to execution time length. Under the condition of needing fine control, the valve execution time can be set longer, so that more operation steps are provided, and accurate adjustment is realized; under the condition that quick opening and closing are needed, the valve execution time can be set to be shorter, and quick positioning of the valve can be realized by fewer operation steps.

Claims

1. An electric valve actuator control device with adjustable execution time is characterized by comprising a single chip microcomputer, wherein the 1 st to 6 th PWM control ports of the single chip microcomputer are connected to a PWM driving circuit of a direct current brushless motor, the PWM driving circuit of the direct current brushless motor is respectively connected to three-phase windings of the direct current brushless motor, a rotor position feedback device HU, HV and HW of the direct current brushless motor is connected to the 1 st to 3 rd digital quantity input ports of the single chip microcomputer through a rotor position detection circuit of the direct current brushless motor, the 1 st analog quantity input port of the single chip microcomputer is connected to a valve opening degree detection circuit, the 4 th and 5 th digital quantity input ports of the single chip microcomputer are respectively connected to an on limit switch and an off limit switch through a valve full-on and full-off state detection circuit, the 6 th to 9 th digital quantity input ports of the single chip microcomputer are connected to an, the 10 th and 11 th digital input ports of the single chip microcomputer are respectively connected with an upper DCS control system valve opening adjusting signal and a valve closing adjusting signal, and the single chip microcomputer further comprises a power supply module connected to the single chip microcomputer and a PWM (pulse width modulation) driving circuit of the direct current brushless motor.

2. The control device of the electric valve actuator with the adjustable execution time as claimed in claim 1, further comprising a liquid crystal display screen, wherein the liquid crystal display screen is connected with the SPI port of the single chip microcomputer through an SPI bus.

3. An electrically operated valve actuator control device having an adjustable execution time as recited in claim 1 wherein said dc brushless motor is a three phase inductive dc brushless motor.

4. The control device of the electrically operated valve actuator with adjustable execution time of claim 1, wherein the power module comprises a 5V DC power supply for supplying power to the single chip microcomputer and a 24V DC power supply for supplying power to the PWM driving circuit of the DC brushless motor.

5. An electro-valve actuator control device with adjustable execution time as in claim 1 wherein the operation buttons include AUTO button for placing the valve in an automatic operation state, MANUAL button for setting the valve in a MANUAL state, and OPEN button and CLOSE button for opening and closing the valve.